Find the volume of CO required to reduce 0.25 mole ferric oxide as per the given equation

Fe₂O₃+3CO$\to$2Fe+3CO₂

(1) 16.8 dm³

(2) 67.2 dm³

(3) 22.4 dm³

(4) 44.8 dm³

 

A 0.1097 gm sample of As₂O₃ require 26.10 ml of KMnO₄ solution for its titration. The molarity of KMnO₄ solution is

1. 0.02

2. 0.04

3. 0.018

4. 0.3

A sample of CaCO₃ is 50% pure. On heating 1.12 litres of CO₂ (at STP) is obtained. The weight of residues left (assuming non-volatile impurity) is:

(Ca = 40, C= 12, O=16)

2 gm Iron pyrite (FeS₂) is burnt with O₂ to form Fe₂O₃ and SO₂. The mass of SO₂ produced is (Fe=56, S=32, O=16)

1. 2 gm

2. 2.13 gm

3. 4 gm

4. 4.26 gm

Calculate the number of ions present in 2L of a solution of 1.6 M K₄[Fe(CN)₆]:

The mass of CO₂ that shall be obtained by heating 10 kg of 80 % pure limestone (CaCO₃) is:

1. 4.4 kg

2. 6.6 kg

3. 3.52 kg

4. 8.8 kg

How many protons are present in 1.8g of ${{\mathrm{NH}}_4}^{+}$ :-

1. N_A

2. 1.2 N_A

3. 1.1 N_A

4. 11 N_A

When 1L of CO₂ is heated with graphite,the volume of the gases collected is 1.8L. What will be the number of moles of CO produced at STP?

1. 0.0357

2. 0.0714

3. 0.0803

4. 14

At STP the moles of oxygen atoms in 2.8 L of CO₂ gas is:-

1. 0.125

2. 0.25

3. 0.5

4. 1

Identify the incorrect statement among the following:

1. 1 mol N^-3 ions have 10 mole electrons.

2. 1 mol O^-2 ions have  6.023 x 10²² electrons.

3. 1 mol CH₄ has 10 mole protons.

4. 1 mol water has 10 mole protons.